# Cross Compile

This manual explains the steps to prepare a basic cross compiling environment on Debian. The build will be installed to `/opt/W64-cross-compile`. If the destination folder is set up right, you do not need any root rights.

The following packages are needed:
- wine
- wine64
- mingw-w64
- mingw-w64-tools
- binutils-mingw-w64

The following sources are needed:
- [glib](https://gitlab.gnome.org/GNOME/glib)
- [atk](https://gitlab.gnome.org/GNOME/atk)
- [pango](https://gitlab.gnome.org/GNOME/pango)
- [gdk-pixbuf](https://gitlab.gnome.org/GNOME/gdk-pixbuf)
- [libepoxy](https://github.com/anholt/libepoxy)
- [GTK+](https://www.gtk.org/)

# Prepare the `cross-file.ini`

This configuration file will be needed on all meson based builds.

	[host_machine]
	system = 'windows'
	cpu_family = 'x86_64'
	cpu = 'x86_64'
	endian = 'little'

	[properties]
	c_args = []
	c_link_args = []

	[binaries]
	c = '/usr/bin/x86_64-w64-mingw32-gcc'
	cpp = '/usr/bin/x86_64-w64-mingw32-g++'
	ar = '/usr/bin/x86_64-w64-mingw32-ar'
	strip = '/usr/bin/x86_64-w64-mingw32-strip'
	pkgconfig = '/usr/bin/x86_64-w64-mingw32-pkg-config'
	windres = '/usr/bin/x86_64-w64-mingw32-windres'
	ld = '/usr/bin/x86_64-w64-mingw32-ld'
	exe_wrapper = 'wine64'


# lib-glib

Compile the library using the following steps.

	mkdir build
	cd build
	meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../../cross-file.ini
	mseon compile

if an error like `glib/glibconfig.h:65:51: error: missing binary operator before token "("` occures edit the line and delete the **G_GNUC_EXTENSION** expression.

	meson install

Because not all compiled `*.dll` files are installed into the destination we need to copy them manualy.

	cp `find -name "*.dll"` /opt/W64-cross-compile/lib/

# atk

Compile the library using the following steps.

	mkdir build
	cd build
	PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../../cross-file.ini
	mseon compile
	meson install

Copy manualy all compiled `*.dll` files to the destination

	cp `find -name "*.dll"` /opt/W64-cross-compile/lib/

# pango

Compile the library using the following steps.

	mkdir build
	cd build
	PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../../cross-file.ini
	mseon compile
	meson install
	cp `find -name "*.dll"` /opt/W64-cross-compile/lib/

# gdk-pixbuf

	mkdir build
	cd build
	PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../../cross-file.ini
	mseon compile
	meson install
	cp `find -name "*.dll"` /opt/W64-cross-compile/lib/

# libepoxy


Compile the library using the following steps.

	mkdir build
	cd build
	PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig meson --buildtype=release --prefix=/opt/W64-cross-compile/ --cross-file ../../cross-file.ini
	mseon compile
	meson install
	cp `find -name "*.dll"` /opt/W64-cross-compile/lib/


# GTK

## preparation beacuse of `wine`

Copy all compiled executeble and library files into the wine windows/system folder.

	cp /opt/W64-cross-compile/bin/*.exe ~/.wine/drive_c/windows/system32/
	cp /opt/W64-cross-compile/lib/*.dll ~/.wine/drive_c/windows/system32/

## workaround for some issues

edit the file `gdk/win32/gdkprivate-win32.h` and search around line 300 for the following declaration. The compiler is missing the **extern** statement here.

	300 /* The singleton selection object pointer */
	301 extern GdkWin32Selection *_win32_selection;

## compile first attempt

Configure and compile the library.

	PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig ./configure --prefix=/opt/W64-cross-compile/ --host=x86_64-w64-mingw32
	PKG_CONFIG_PATH=/opt/W64-cross-compile/lib/pkgconfig make
	make install

## fix and install the compilation

	/bin/bash: Zeile 1: ../../gtk/gtk-update-icon-cache.exe: Kann die Binärdatei nicht ausführen: Fehler im Format der Programmdatei
	make[3]: *** [Makefile:1673: install-update-icon-cache] Fehler 126

Edit the Makefile in demos/gtk-demos and add in line the wine prefix. Try to run the `make install`command and do the same for the next errors.

	/bin/bash: Zeile 1: ../../gtk/gtk-update-icon-cache.exe: Kann die Binärdatei nicht ausführen: Fehler im Format der Programmdatei
	make[5]: *** [Makefile:1184: install-update-icon-cache] Fehler 126
	make[5]: Verzeichnis „/home/steffen/gtkcrosscompile/gtk+-3.24.0/demos/widget-factory“ wird verlassen

If the compilation did well copy all *.dll files into the destination.	

	cp `find -name "*.dll"` /opt/W64-cross-compile/lib/